From the answer:
hi , I noticed when someone tag me, I would get 2 different notification in the same time: First, [someone] replied to topic [topic] Second, [someone] @mentioned you in [topic] You might get those ones too when read my reply.

From the answer:
Welcome to the Community, .... Below are the possible reasons why Social Security taxes are calculating incorrectly: QuickBooks is not updated, or there is an internet interruption during the update.